var myHeight = 450;
if (typeof (window.innerHeight) == 'number') {
    myHeight = window.innerHeight;
} else if (document.documentElement && document.documentElement.clientHeight) {
    myHeight = document.documentElement.clientHeight;
} else if (document.body && (document.body.clientWidth || document.body.clientHeight)) {
    myHeight = document.body.clientHeight;
}
document.write("<img src='images/blank.gif' width=1 height=" + myHeight + " border=0>");